TV best bets: Sunday, Aug. 24

8 p.m., FOX: The Simpsons — "Harry Potter" himself, Daniel Radcliffe, joins the animated show’s ever-lengthening list of guest voices in "Diggs." He voices the title character, a transfer student who saves Bart from bullies, then begins to teach him falconry. Diggs isn’t above using his bird, named Freedom, to steal items from various residents of Springfield.

9 p.m., ABC: Rising Star — One aspiring star rises to the very top in this season finale, as viewers’ real-time voting determines the winner of the show’s maiden round. Judges Brad Paisley, Kesha and Ludacris weigh in one more time on the contestants who have endured to this final stage of the competition. A recording contract — arguably the most logical grand prize that could be offered here — will go to the victor. Josh Groban is the host.

9 p.m., LIFETIME: Witches of East End — "Buffy the Vampire Slayer" alumnus James Marsters guest stars in the new episode "Art of Darkness" as Tarkoff, an old friend of the Beauchamp family who pays a visit to Joanna and Freddie (Julia Ormond, Christian Cooke). Wendy (Madchen Amick) encounters someone from her own past when she attends an art gala with Freya, Ingrid and Dash (Jenna Dewan Tatum, Rachel Boston and Eric Winter). Daniel DiTommasso and Bianca Lawson also star.

9 p.m., MTV: 2014 MTV Video Music Awards — Beyoncé will receive the coveted Video Vanguard Award during this year’s ceremonies, broadcast from the famous Forum arena in Inglewood, Calif. Usher also is expected to return to the VMA stage, while superstar rockers Maroon 5 will perform live during the telecast for the first time. Nominees for video of the year include Beyoncé’s "Drunk in Love," Iggy Azalea’s "Fancy," "Wrecking Ball" by Miley Cyrus, Pharrell Williams’ "Happy" and "Chandelier" by Sia.

9 p.m., WNET/CHANNEL 13: Masterpiece Mystery! — Jack Davenport switches from playing a brilliant stage director on "Smash" to a brilliant surgeon, whose roving eye generates problems, as the new three-part drama ‘Breathless’ begins. An early-1960s London medic, the married Otto (Davenport) is attracted to a nurse (Catherine Steadman) whose sister (Zoe Boyle), one of his past conquests, is engaged to one of his colleagues (Oliver Chris).

10 p.m., CBS: Reckless — Lee Anne’s (Georgina Haig) case against the Charleston Police Department has been simmering, and Roy (Cam Gigandet) makes a move to put an end to it in the new episode "Damage Control." He tries to get Terry (Shawn Hatosy) to testify against her — which likely would generate damage she couldn’t possibly control.